<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>背景动态变化的登陆界面</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <div class="container">
        <div class="tit">登录</div>
        <input type="text" placeholder="账号">
        <input type="password" placeholder="密码">
        <button>登录</button>
        <span>没有账号？ <a href="#">去注册</a> </span>
    </div>
    <div class="square">
        <ul>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
        </ul>
    </div>
    </div>
    <div class="circle">
        <ul>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
        </ul>
    </div>
</body>
</html>